The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 2018
Filed:
Dec. 08, 2009
Nobuo Suemitsu, Yachiyo, JP;
Sadayuki Muto, Saitama, JP;
Shinichi Toda, Tokyo, JP;
Minoru Igarashi, Shiroi, JP;
Nobuo Suemitsu, Yachiyo, JP;
Sadayuki Muto, Saitama, JP;
Shinichi Toda, Tokyo, JP;
Minoru Igarashi, Shiroi, JP;
KAWASAKI JUKOGYO KABUSHIKI KAISHA, Kobe-Shi, JP;
Abstract
In a low NOx boiler of the present invention, a high-temperature reductive combustion zone is provided to an upper portion of a rectangular combustion chamber, and a second-step combustion zone is provided to a middle stage of the combustion chamber. A wall provided below the second-step combustion zone is tapered to narrow the combustion chamber, with a taper angle of approximately 35° or so, relative to a vertical line. An ash discharge port is provided to a furnace bottom portion, and a gas outlet port communicated with a rear pass is provided to a lower side face of the second-step combustion zone. This rear pass is connected with a further post-treatment step, via a super-heater tube and an economizer.